<template>
    <div>
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
      </el-breadcrumb>
  
      <!-- 卡片区域 -->
      <el-card>
        <el-alert title="注意：只允许为第三级分类设置相关参数!" type="warning" show-icon :closable="false">
        </el-alert>
  
        <!-- 选择商品分类区域 -->
        <el-row class="cat_opt">
          <el-col>
            <span>选择商品分类：</span>
            <!-- 选择商品分类的级联选择框 -->
            <el-cascader v-model="selectedCateKeys" :options="catelist" :props="cateProps" @change="handleChange"></el-cascader>
          </el-col>
        </el-row>
        <!-- Tabs页签区域 -->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
          <!-- 添加动态参数 面板 -->
          <el-tab-pane label="动态参数" name="many">
            <!-- 添加参数的按钮 -->
            <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">
              添加参数
            </el-button>
            <!-- 动态参数表格 -->
            <el-table :data="manyTableData" border stripe>
              <!-- 展开行 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!-- 循环渲染tag标签 -->
                  <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                  <!-- 输入文本框 -->
                  <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)" style="width:120px">
                  </el-input>
                  <!-- 添加按钮 -->
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <!-- 索引列 -->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
          <!-- 添加静态属性 面板 -->
          <el-tab-pane label=" 静态属性" name="only">
            <!-- 添加参数的按钮 -->
            <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">
              添加属性
            </el-button>
            <!-- 添加静态属性  面板 -->
            <el-table :data="onlyTableData" border stripe>
              <!-- 展开行 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!-- 循环渲染tag标签 -->
                  <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                  <!-- 输入文本框 -->
                  <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)" style="width:120px">
                  </el-input>
                  <!-- 添加按钮 -->
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <!-- 索引列 -->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="属性名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
        </el-tabs>
      </el-card>
      <!-- 添加参数对话框 -->
      <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @closed="addDialogClosed">
        <!-- 添加参数 对话框 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="dialogaddDialogVisibleVisible = false">取 消</el-button>
          <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
      </el-dialog>
  
      <!-- 修改参数对话框 -->
      <el-dialog :title="'修改'+titleText" :visible.sync="editDialogVisible" width="50%" @closed="editDialogClosed">
        <!-- 修改参数 对话框 -->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="editDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
      </el-dialog>
  
      <!-- 删除参数对话框 -->
      <el-dialog :title="'删除'+titleText" :visible.sync="editDialogVisible" width="50%" @closed="editDialogClosed">
        <!-- 修改参数 对话框 -->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="editDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
      </el-dialog>
    </div>
  </template>
  
  <script>
  export default {
    data() {
      return {
        // 商品分类列表
        catelist: [],
        //   级联选择框配置对象
        cateProps: {
          // 具体选中属性
          value: 'cat_id',
          // 所看到的属性
          label: 'cat_name',
          // 父子嵌套使用的属性
          children: 'children',
          expandTrigger: 'hover'
          // checkStrictly: true
        },
        // 级联选择框 双向绑定数组
        selectedCateKeys: [],
        //   被激活的页签的名称
        activeName: 'many',
        //   动态参数数据
        manyTableData: [],
        //   静态属性数据
        onlyTableData: [],
        //   控制添加对话框的显示与隐藏
        addDialogVisible: false,
        //   添加参数的表单数据对象
        addForm: {
          arrt_name: ''
        },
        //   添加表单的验证规则对象
        addFormRules: {
          attr_name: [
            {
              required: true,
              message: '请输入参数名称',
              trigger: 'blur'
            }
          ]
        },
        //   控制修改对话框 显示与隐藏
        editDialogVisible: false,
        //   修改的表单数据对象
        editForm: {},
        //   修改表单的验证规则对象
        editFormRules: {
          attr_name: [
            {
              required: true,
              message: '请输入参数名称',
              trigger: 'blur'
            }
          ]
        },
        // 控制按钮与文本框切换显示
        inputVisible: false,
        // 文本框中输入的内容
        inputValue: ''
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      //   获取所有商品分类列表
      async getCateList() {
        const { data: res } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品分类失败！')
        }
        this.catelist = res.data
        console.log(this.catelist)
      },
      // 级联选择框 选中项
      async handleChange() {
        this.getParamsData()
      },
      // Tab页签点击事件的处理函数
      handleTabClick() {
        //   console.log(this.activeName)
        this.getParamsData()
      },
      // 获取参数 列表数据
      async getParamsData() {
        if (this.selectedCateKeys.length !== 3) {
          this.selectedCateKeys = []
          // 为保证非三级参数显示 表格  将其清空
          this.manyTableData = []
          this.onlyTableData = []
          return
        }
        //   证明选中三级分类
        //   console.log(this.selectedCateKeys)
        // 根据所选分类的id,和当前所处的面板，获取对应参数
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: this.activeName }
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败！！！')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          // 控制文本框的显示与隐藏
          item.inputVisible = false
          // 文本框中输入的值
          item.inputValue = ''
        })
  
        console.log(res.data)
        //   判断数据到底属于哪个表格
        if (this.activeName === 'many') {
          this.manyTableData = res.data
        } else {
          this.onlyTableData = res.data
        }
      },
      // 监听添加对话框的关闭事件
      addDialogClosed() {
        this.$refs.addFormRef.resetFields()
      },
      // 点击按钮 添加参数
      addParams() {
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) return
          const { data: res } = await this.$http.post(
            `categories/${this.cateId}/attributes`,
            {
              attr_name: this.addForm.attr_name,
              attr_sel: this.activeName
            }
          )
          if (res.meta.status !== 201) {
            return this.$message.error('添加参数失败！！')
          }
          this.$message.success('添加参数成功！！')
          this.addDialogVisible = false
          this.getParamsData()
        })
      },
      // 点击按钮，展示修改对话框
      async showEditDialog(attrId) {
        // 查询当前参数的id
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes/${attrId}`,
          {
            params: { attr_sel: this.activeName }
          }
        )
  
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数信息失败！！！')
        }
        this.editForm = res.data
        this.editDialogVisible = true
      },
      // 重置修改的表单
      editDialogClosed() {
        this.$refs.editFormRef.resetFields()
      },
      // 点击按钮，修改参数信息
      editParams() {
        this.$refs.editFormRef.validate(async valid => {
          if (!valid) return
          const {
            data: res
          } = await this.$http.put(
            `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
            { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
          )
          if (res.meta.status !== 200) {
            return this.$message.error('修改参数失败！！！')
          }
          this.$message.success('修改参数成功！！！')
          this.getParamsData()
          this.editDialogVisible = false
        })
      },
      // 根据id 点击按钮，删除参数信息
      async removeParams(attrId) {
        const confirmResult = await this.$confirm(
          '此操作将永久删除该参数, 是否继续?',
          '提示',
          {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }
        ).catch(err => err)
  
        // 用户取消删除操作
        if (confirmResult !== 'confirm') {
          return this.$message.info('已取消删除！')
        }
  
        //   删除的业务逻辑
        const { data: res } = await this.$http.delete(
          `categories/${this.cateId}/attributes/${attrId}`
        )
  
        if (res.meta.status !== 200) {
          return this.$message.error('删除参数信息失败！！')
        }
  
        this.$message.error('删除参数信息成功！！')
        this.getParamsData()
      },
      // 文本框失去焦点 或按下enter
      async handleInputConfirm(row) {
        // console.log('ok')
        if (row.inputValue.trim().length === 0) {
          row.inputValue = ''
          row.inputVisible = false
          return 0
        }
        // 若果没有return ,判断输入了内容，需要做后续处理
        row.attr_vals.push(row.inputValue.trim())
  
        // 置空值，隐藏输入框
        row.inputValue = ''
        row.inputVisible = false
        this.saveAttrVals(row)
      },
      // 将对attr_vals的操作保存至数据库
      async saveAttrVals(row) {
        // 发起请求，向数据库传入数据
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${row.attr_id}`,
          {
            attr_name: row.attr_name,
            attr_sel: row.attr_sel,
            attr_vals: row.attr_vals.join(' ')
          }
        )
  
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数项失败！')
        }
  
        this.$message.success('修改参数项成功！')
      },
      // 点击按钮 展示文本输入框
      showInput(row) {
        row.inputVisible = true
        // 让文本框自动获得焦点
        // $nextTick  方法的作用：当页面上元素被重新渲染之后才会执行回调函数中的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus()
        })
      },
      // 删除对应参数和选项
      handleClose(i, row) {
        row.attr_vals.splice(i, 1)
        this.saveAttrVals(row)
      }
    },
    computed: {
      //   如果按钮需要被禁用，则调用此函数 return true
      isBtnDisabled() {
        if (this.selectedCateKeys.length !== 3) {
          return true
        }
        return false
      },
      // 当前选中的三级分类的id
      cateId() {
        if (this.selectedCateKeys.length === 3) {
          return this.selectedCateKeys[2]
        }
        return null
      },
      // 动态计算 标题文本
      titleText() {
        if (this.activeName === 'many') {
          return '动态参数'
        } else {
          return '静态属性'
        }
      }
    }
  }
  </script>
  
  <style lang="less">
  .cat_opt {
    margin-top: 15px 0;
  }
  .el-cascader {
    margin-top: 5px;
    width: 200px;
  }
  
  .el-tag {
    margin: 10px;
  }
  .input-new-tag {
    width: 120px;
  }
  </style>
  